Rationale

For certain hosts it may not be desirable to run a webserver to serve thefile required for the LE verification step. For example when you run theLE client with manual on a different host and use the SSL cert for a serviceother than a webserver. For such cases it could be handy to fire up a container,serve the verification code and shut it down when finished.This image was optimized for size, coming in at less than 6 MB.